Ragman what I have done on other motorhomes was to use the blue brake wire that is in the 7 way round plug to send signal to cab under the dash is a 4 wire plug for optional brake control and tie into blue wire i used a led light mounted in the dash
Richard
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Richard M / Carol B
2020 Entegra Accolade 37K
2021 F150 Platinum
FMCA #F432587
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